$\"\"$

The function is $\"\"$ .

Find $\"\"$ .

$\"\"$

Apply derivative on each side with respect to $\"\"$ .

$\"\"$

Graph:

Graph the functions $\"\"$ and $\"\"$ .

$\"\"$

Observe the graph.

As $\"\"$ in the intervals $\"\"$ and $\"\"$ , hence the function $\"\"$ is increasing.

As $\"\"$ in the intervals $\"\"$ ,hence the function $\"\"$ is decreasing.

$\"\"$

$\"\"$ .